US2010045910A1PendingUtilityA1

Laminated optical film, and liquid crystal panel and liquid crystal display apparatus using the laminated optical film

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Assignee: NITTO DENKO CORPPriority: Nov 20, 2006Filed: Oct 23, 2007Published: Feb 25, 2010
Est. expiryNov 20, 2026(~0.3 yrs left)· nominal 20-yr term from priority
Inventors:Masato BitouShunsuke ShutouMisaki SabaeIkuo KawamotoHironori Motomura
G02F 2413/03G02B 5/3083G02F 1/13363G02F 1/133634G02F 1/133531G02F 2413/04G02B 5/305
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Claims

Abstract

An object of the present invention is to provide a laminated optical film, a liquid crystal panel, and a liquid crystal display apparatus that have an excellent screen contrast and have a small color shift. A laminated optical film of the present invention includes in this order: a polarizer; a first optical compensation layer that has a refractive index ellipsoid exhibiting a relationship of nx>ny=nz and an in-plane retardation Re 1 of 80 to 300 nm; a second optical compensation layer that has a refractive index ellipsoid exhibiting a relationship of nz>nx=ny; and a third optical compensation layer that has a refractive index ellipsoid exhibiting a relationship of nx>ny=nz and an in-plane retardation Re 3 of 80 to 200 nm, wherein an absorption axis of the polarizer is perpendicular to a slow axis of the first optical compensation layer.

Claims

exact text as granted — not AI-modified
1 . A laminated optical film, comprising, in this order:
 a polarizer;   a first optical compensation layer that has a refractive index ellipsoid exhibiting a relationship of nx>ny=nz and an in-plane retardation Re 1  of 80 to 300 nm;   a second optical compensation layer that has a refractive index ellipsoid exhibiting a relationship of nz>nx=ny; and   a third optical compensation layer that has a refractive index ellipsoid exhibiting a relationship of nx>ny=nz and an in-plane retardation Re 3  of 80 to 200 nm,   wherein an absorption axis of the polarizer is perpendicular to a slow axis of the first optical compensation layer.   
     
     
         2 . A laminated optical film, comprising, in this order:
 a polarizer;   a first optical compensation layer that has a refractive index ellipsoid exhibiting a relationship of nx>ny>nz and an in-plane retardation Re 1  of 80 to 300 nm;   a second optical compensation layer that has a refractive index ellipsoid exhibiting a relationship of nz>nx=ny; and   a third optical compensation layer that has a refractive index ellipsoid exhibiting a relationship of nx>ny=nz and an in-plane retardation Re 3  of 80 to 200 nm,   wherein an absorption axis of the polarizer is perpendicular to a slow axis of the first optical compensation layer.   
     
     
         3 . A laminated optical film according to  claim 1 , further comprising a fourth optical compensation layer that is placed on a side of the third optical compensation layer opposite to the second optical compensation layer and has a refractive index ellipsoid exhibiting a relationship of nx=ny>nz. 
     
     
         4 . A liquid crystal panel, comprising a liquid crystal cell and a laminated optical film according to  claim 1 . 
     
     
         5 . A liquid crystal panel according to  claim 4 , wherein the laminated optical film is placed on a backlight side. 
     
     
         6 . A liquid crystal panel according to  claim 5 , wherein a laminated film including a polarizer and a fifth optical compensation layer that has a refractive index ellipsoid exhibiting a relationship of nx>ny=nz and an in-plane retardation Re 5  of 80 to 200 nm is placed on a viewer side. 
     
     
         7 . A liquid crystal panel according to  claim 4 , wherein the liquid crystal cell is in a VA mode. 
     
     
         8 . A liquid crystal display apparatus having a liquid crystal panel according to  claim 4 .

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